A tried-and-true dressing hack that had a renaissance this summer, the new grown-up take on this one-and-done look is more weekend-ready than schoolyard when paired with ankle boots and a buttoned-to-the-top oxford shirt (think Olivia Palermo and Blake Lively — not your little cousin). After all, there's an inherent no-fuss, cool-girl quality to this new jumpsuit that makes getting dressed a snap.

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